Transitions on images is a feature that has been requested for WebKit
often. Here are some requests we've gotten about it:
(1) The ability to transition between two gradients by actually
running transition functions on the colors and stops.
(2) The ability to transition between non-gradient images by doing a
cross-fade (or from/to a gradient and non-gradient).
(3) The ability to specify other types of image transitions (could
probably be done with a new transition property that had a simple list
of possible transitions, e.g., dissolve, fade, etc.)
(4) We've also had discussions about how transitions could be used
internally to possibly implement Vista-style control transitions,
since those are essentially just image fades as well (albeit between
two OS-rendered images). This could involve saying that the CSS3
"appearance" property transitions somehow.
dave
(hyatt@apple.com)